Die-head attachment.



W. H. GATES. DIE HEAD ATTACHMENT. APPLICATION F ILED SEPT-10,1915.

Patented Dec. 19, 1916.

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WVWMM I A TTORNEY WILLIAM H. GATES, OF NEVZ HAVEN, CONNECTICUT.

DIE-HEAD ATTACHMENT.

Specification of LettersPatent.

Appli-cation filed September 10, 1915. Serial No. 49,892. r i

To aZl whom it may concern:

Be it known that 1, WILLIAM H. 'GA'rns,

- citizeniof the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in Die-Head Attachments; and I do hereby declare the following to be a full, clear, and exact, description of he invention, such as-will enable others skilled in the art to'which it appertains to make and use the same.

My invention relatesto die heads undisan improvement on the construction shown and described in the patent granted to me on-riugust 3, 1915, No. 1,148,510.

The present improvement consists in the application of a stop for automatically opening the threading dies, and mechanism for effecting a roughing and finishing out,

and it is particularly adapted'to die heads used on hand operated machines Referring to the'accompanying drawings in. wh1ch Figure 1 representsa broken 116W partly in section of the die head; Fig. 2 is an upper Y lever; Fig. 8 is a detail bottom plan view of the segment connected with the. thread cutting mechanisimFig. 9 1s a detail vlew of the indicator dial; Fig. 1s a detail bottom 'planview of the'cam disk;' and-Fig. 1-1 1 is a detail view of the locking bolt for mainaining the sliding shell in close relation with the die carrying head. I

The head 1 is provided in its "forward end with the slots 2 to receive the threading dies 3. Said head is mounted in the mouth of the holder 4 and has a longitudinal movement therein. The shank 5 of said holder is adapted to enter any movable membernot shownlike, for instance, a turret head mounted on a longitudinally movable slide.

The shell 6 embraces both the holder 4 and the die head 1 and has a longitudinal movement on each. 7 are studs anchored in the sliding shell 6 and are secured thereto by pins, two of which, 8, are shown in Fig. 1.

The forward ends of these studs are pro-- videdas in my former patent,before mentionedwith cams'9, Fig. '1, to operate in the cam grooves 1O, Fig. 3, to actuate the threading dies to open and close. These studs have a free longitudinal movement in the holes 11 of the head.

When the threading dies are in position for cutting threads, the head 1 and sliding shell 6 are locked together as shown in Figs,

1,2 and 4, as follows: 12,'Fig. 6, is a disk rotatably mounted in the sliding shell whose bottom, F ig." 10, is provided with the cam recess 13 to admit the upper end 14 of the locking'bolt 15, Fig. 11,.and is temporarily held therein by the spring 16,- Fig. 4. The

indicator dial plate'17, Fig. 9, rests against the shoulder 18, Fig. 6,- and also in the recess 19, Fig. 4-. --seealso F1g. 81s a segmentprovided --w-ith' the hole 21 adapted to embrace the stud 22 of the cam disk 12 and overlie the same. The-indicator dial plate is secured to the diskbythe screw 17, Fig. 9, and-the segment is secured to the disk'by the nut 23, Figs. 2, 4 and 5.

24 is a trip rod passing freely through the upper end of the trip lever 25, pivotally' supported on the pin 26, Fig. 4, carried by the-head 1. The threaded end 27 is adjustably supported in the stud 28 secured to the head f the holder. The am nuts 29 locate the head 30 of the triprod with respect to the trip lever to regulate thetravel of the head. The lower end or arm 31' of the trip lever islocatedin the'notch 32 of the locking bolt 15when the die carrying head 1 and sliding shell G are locked together as shown in Fig. 4.

' l Vhentheholder has been moved forward by aturret or other like means and engaged the threading dies with the work-not shownthe head 1 will be drawn forward in the mouth of the holder a distance representing the length of thethread to be cut, when the trip lever will contact with the head 30 of the trip rod and cause said lever to tilt on its pivotal support and depress the locking bolt 15 a distance sufficient to release its upper end 14 with its engagement with the disk. cam and permit the sliding shell to be disengaged from thehead 1 and carried back by means of the springs 33, Figs. 3 and 4, which rearward movement is limited by means of the inner end of the spring actuated pin 34 traveling in the slot 35, Fig.

Patented nee. is. rare.

4, located in the shell. The head 1 is also automatically returned by the stored up tension in the spring 36. This spring is located between the shoulder 37 of the holder shank 5 and the nut 38 mounted on the outer threaded end of the head extension rod 39, so

that, when the head is moved forward, the

spring 36 will be Compressed and suflicient force stored up therein to return the head as before mentioned. When the head and shell have thus been retreated, the latter will lie in close proxin to the cam 40 which is manually actua by its handle 41 to relock the head and shell together for a repetition of the threading operation. This combined cam and handle is journaled on the pin 42,Fig. 3, which pin is secured in the rear end wall of the die carrying head 1 and travels freely in the elongated slot 43 of the head 4 of the holder.

' The mechanism for varying the cut comprises the segment 20 secured to the disk 12, as before mentioned, so that, when the segment is rotated, it will also rotate the disk to locate the position. of the locking bolt 15 and thus determine the locked positionof the sliding shell 6 with respect to the die carrying head 1. 44 is a handle by means of which the segment is manuallv operated.

When the segment is brought against the stop 45, Figs. 2 and 5, the dies will be in the proper position for taking a roughing cut, and when brought against the stop 46, the sliding shell will be brought closer to the die head and, by this closer relation, the threading dies will be correspondingly advanced/to give the finished cut. To prevent accidental shifting of the segment when brought against either of said stops, the pins 47 are located in the sliding shell 6 and their pointed ends engage the depressions 48, Fig. 8, on the underside of the segment. The underlying springs 49, Fig. 5, maintain the engagement of the pins with the seg ment. These pins have the elongated grooves 50 adapted to receive the reduced points of retaining screws to prevent their displace ment when the segment is removed. One of said retaining screws, 51, is shown in Fig. 4. Having thus described my invention, what I claim is l. A die head carrying radially operating threading dies, a holder in which the head has a longitudinal movement, a sliding shell embracing the head and holder, die actuating means carried by the shell to open and close the dies, mechanism for locking the head and shell together carried by the head and shell, tripping mechanism carried by the head and holder whereby the head and shell are unlocked, automatic means for retreat ing the shell to open the dies,'and automatic means for retreating the head.

2. A die head carrying radially operatin threading dies, a holder in which the head has a longitudinal movement, a sliding shell overlying the head and holder, die actuating means carried by the shell to open and close the dies, mechanism for locking the head and shell together carried by the head and shell, tripping mechanism carried by the head and holder whereby the head and shell are unlocked, automatic means for retreating the shell to open the dies,'and automatic means for retreating the head, and manually operated means for relocklng the shell to the head.

3. A die head carrying radially operating threading dies, a longitudinally operating member carrying die actuating members and a rotatable cam member carried by said op erating member, a member carried by the die head to engage with the cam member, and a manually operated member for rotating the cam member to vary the distance of the dies from the work and thus effect a roughing and finishing out.

In testimony whereof I aflix my signature 1n presence of two witnesses.

WILLIAM H. GATES. Vitnesses JOHN G. Evans, TI-IEO. E. Horrniv.

eopiesof this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

